WordReference Random House Unabridged Dictionary of American English © 2020
Spanish moss, 
  • Plant Biologyan epiphytic plant, Tillandsia usneoides, of the southern U.S., having narrow, grayish leaves and growing in long festoons that drape the branches of trees.
    • 1815–25, American.

    Collins Concise English Dictionary © HarperCollins Publishers::
    Spanish moss n
    1. an epiphytic bromeliaceous plant, Tillandsia usneoides, growing in tropical and subtropical regions as long bluish-grey strands suspended from the branches of trees
    2. a tropical lichen, Usnea longissima, growing as long trailing green threads from the branches of trees
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